From: Robert Hancock <hancockrwd@gmail.com>
To: Thomas Renninger <trenn@suse.de>
Cc: davej@codemonkey.org.uk, mark.langsdorf@amd.com,
cpufreq@vger.kernel.org, venkatesh.pallipadi@intel.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/7] CPUFREQ: powernow-k8: Get transition latency from ACPI _PSS table
Date: Sun, 08 Feb 2009 12:35:52 -0600 [thread overview]
Message-ID: <498F2608.9030809@gmail.com> (raw)
In-Reply-To: <1233679606-1971-5-git-send-email-trenn@suse.de>
Thomas Renninger wrote:
> From: Mark Langsdorf <mark.langsdorf@amd.com>
>
> At this time, the PowerNow! driver for K8 uses an experimentally
> derived formula to calculate transition latency. The value it
> provides is orders of magnitude too large on modern systems.
> This patch replaces the formula with ACPI _PSS latency values
> for more accuracy and better performance.
>
> I've tested it on two 2nd generation Opteron systems, a 3rd
> generation Operton system, and a Turion X2 without seeing any
> stability problems.
>
> Signed-off-by: Mark Langsdorf <mark.langsdorf@amd.com>
> Signed-off-by: Thomas Renninger <trenn@suse.de>
> ---
> arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 28 ++++++++++++++++++++++------
> 1 files changed, 22 insertions(+), 6 deletions(-)
Hopefully somebody is pushing this for .29? This seems to make a big
difference in system responsiveness on my Athlon X2 system.
next prev parent reply other threads:[~2009-02-08 18:36 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-03 16:46 CPUFREQ: Ondemand and powernow-k8 enhancements/fixes/cleanups Thomas Renninger
2009-02-03 16:46 ` [PATCH 1/7] CPUFREQ: Introduce /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_transition_latency Thomas Renninger
2009-02-03 16:46 ` [PATCH 2/7] CPUFREQ: ondemand/conservative: deprecate sampling_rate{min,max} Thomas Renninger
2009-02-04 5:03 ` Andrew Morton
2009-02-03 16:46 ` [PATCH 3/7] CPUFREQ: ondemand/conservative: sanitize sampling_rate restrictions Thomas Renninger
2009-02-04 5:07 ` Andrew Morton
2009-02-04 10:07 ` Thomas Renninger
2009-02-03 16:46 ` [PATCH 4/7] CPUFREQ: powernow-k8: Get transition latency from ACPI _PSS table Thomas Renninger
2009-02-08 18:35 ` Robert Hancock [this message]
2009-02-03 16:46 ` [PATCH 5/7] CPUFREQ: powernow-k8: Always compile powernow-k8 driver with ACPI support Thomas Renninger
2009-02-03 16:46 ` [PATCH 6/7] CPUFREQ: powernow-k8: Only print error message once, not per core Thomas Renninger
2009-02-04 5:09 ` Andrew Morton
2009-02-04 9:59 ` Thomas Renninger
2009-02-03 16:46 ` [PATCH 7/7] ACPI: cpufreq: Remove deprecated /proc/acpi/processor/../performance proc entries Thomas Renninger
2009-02-04 5:13 ` Len Brown
2009-02-03 16:48 ` CPUFREQ: Ondemand and powernow-k8 enhancements/fixes/cleanups Dave Jones
2009-02-03 21:21 ` Dave Jones
2009-02-03 23:29 ` Thomas Renninger
2009-02-03 23:44 ` Dave Jones
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